Pinking machine



Aug. 28, 1928.

A. DVILNSKY PINKING MACHINE Filed Jan. 11, 1927 2 Sheets-Sheet A 1 Zlwwntoz I I I I 1 Patented Aug. 28, 1928.

UNITED STATES ABRAHAM DVILNSKY, OF BROCKTON, MASSACHUSETTS.

PINKING MACHINE.

Application filed January 11. 1927. Serial No. 160,443.

The present invention relates to machines for cutting leather or the like and more particularly to machines for pinking or serratin strips of leather or like material.

ne object of the invention is the revis on of a machine of the class described or dividing leather strips to form welting for boots and shoes and simultaneously pinking or serrating the ed es of the resulting strips.

Another ob]ect of the invention is the provision of an improved cutter in a machine of the class described.

A further object of the invention is the provision of an improved roller coacting with the cutter.

Other objects of the invention will be apparent from the following description, and for a complete understanding of the invention reference is to be had thereto and to the accompan ing drawings forming a part of this speci cation.

In the drawings Fig. 1 is a front elevation of the machine embodying the present invention;

Fig. 2 is an enlarged view on the line 22 of Fig. 1;

Fig. 3 is a view on the l ne 33 of F g. 2;

Fig. 4 is a view on the line 44 of F 1g 2;

Fig. 5 is an enlarged side view of the 1mproved cutter;

Fig. 6 is a perspective view of a fragment of a leather strip upon WhlCh the machine operates; and

Fig. 7 is a perspective view of a fra ent of the strip resulting from the operation of the machine.

The machine according to the present 1nvention comprises a support or standard 10 having a bracket 11. The cutter 12 1s preferably in the form of a Wheel secured to a shaft 13 mounted in the bracket 11. A companion roller 14 is secured to a shaft 15 also mounted in the bracket 11. The shafts 13 and 15 have meshing gears 17 and 18, respectively. The shaft 13 is driven by a bevel gear 19 which meshes with a bevel gear 20 secured to a shaft 21 mounted in the standard 10. Any suitable means such as a belt 22 and pulley 23 may be used for d11V1l'lg the shaft 21 and, through the mechanisms Just described, the cutter 12 and companion roller 14.

A grooved guide roller 24 is loosely mounted on a shaft 25 supported in any suitable manner as on a bracket 11 or on a separate support (not shown). This roller 24 serves cry constituting a zig-zag cutting surface and an inner section of increased thickness 31 for the proper degree of rigidity. The zigzag surface 30 consists of cutting teeth or blades 32 which extend back from the periphery of the wheel in parallel planes 33 and 34, shown in. Fig. 4, for a distance greater than the thickness of the strip that is subjccted to the'cutting or serrating action of this cutter element. By thus arranging the cutting teeth in parallel planes, there is no crowding of the material. of the strip 26 and a clean cut is accordin ly obtained.

The companion ro ler 14 is constructed preferably as shown. in Fig. 4. The roller 14 comprises a section 35 having a peripheral flange 36 and a peripheral groove 37. A ring 38 of fibre or brass or like materialis mounted on the section 35 in the groove 37 and is held in place by 'a clamping member 39 which has a flange 40 peripherally thereof which cooperates with the flange 36 to form a circumferential groove 41. Nuts 42 and 43 may be employed for securing the roller 14 on its actuating. shaft 15. It will be noted that the ring 37 is removable and may be replaced when worn, and it will be understood from this disclosure that the ring 37 is of softer material than the cutter elements 32 so that these elements remain sharp for an increased length of time.

In an application filed January 11, 1927, Ser. N 0. 160,444, I have shown and described a method of forming welts from strips of leather such as strip 26 shown in Fig. 6. This strip comprises an intermediate longitudinally extending rib 26. The strip 26 is divided into two strips 26 each of which has a marginal flange 26", the edge of which is serrated or pinked as at 27 To thus form the strips 26, the strip 26 is subjected to the action of the cutter element 12 cooperating with the companion roller 14.

As shown by Figs. 2 and 3, the strip 26 is passed between the cutter 12 and the roller 14 the emotion of which draws the strip therebetween, dividing the strip and imparting to the edges thereof the pinked edges 27; The strip 26 is guided by the roller 24 and is held in the groove 41 of the cutter element companion roller 14 by the arms 28 and 29, as shown more clearly by Fig. 3. \Vhen a ribbed strip 26 is being treated, the guide arms 28 and 29 are disposed on opposite sides of the rib 26, but it will be understood that the arms 28 andQQ may be used with advantage with a strip of other cross section. The groove 41 is preferably substantially the width of the strip being treated so that strips of identicalcharacteristics may be produced with the use of the roller l land the cutter element having the cutting teeth 32 as shown.

While I have shown and described the preferred embodiment of the invention, it will be understood that the disclosure is more or less illustrative of the principles of the invention and that certain changes in the constructiomand arrangement of parts may be made without departing from the invention as defined by the appended claims.

Having thus described the invention. What I claim and desire to secure by, Letters Patent of the United States is: V

1. Ina machine of the class described, a rotary pinking wheeha companion roller said roller eo'acting with said pinking whee for drawingmaterial therebetween -for dividing said material and pinking the edges of the divided portions, means for holding saidinaterial against roller, and means for positively driv ng said cutter and roller. 2. In a-machmeof theclassdescribed, 0.

rotary cutter, a companionroller having a peripheral groove, said cutter and roller coacting to draw material therethrough and subject said material to theaction of said cutter, and means for holding said material against said companion roller in said groove.

8. In a pinking machine, a pinking cutter, and a companion roller having a ring in juxtaposition with the periphery of said cuttor for co-acting therewith, said ring being of softer material than that of the cutter.

4. In a pinking machine, a pinking cutter,

a companion roller having a ring in juxtaposition with the periphery of the cutter for co-acting therewith, and means for removably associating said ring with said roller.

In a machine of: the class described, a

rotary cutter, and a companionrroller, said cutter and roller co-acting to draw a strip of material therethroiigh to be subjected to the ABRAHAM DVILNSKYL 

